drivers/char/hw_random/via-rng.c

File Facts

System

Linux kernel

Corpus path

drivers/char/hw_random/via-rng.c

Extension

.c

Size

6171 bytes

Lines

228

Domain

Driver Families

Bucket

drivers/char

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• crypto/padlock.h
• linux/module.h
• linux/kernel.h
• linux/hw_random.h
• linux/delay.h
• asm/cpu_device_id.h
• asm/io.h
• asm/msr.h
• asm/cpufeature.h
• asm/fpu/api.h

Detected Declarations

• function xstore
• function via_rng_data_present
• function via_rng_data_read
• function via_rng_init
• function via_rng_mod_init
• function via_rng_mod_exit
• module init via_rng_mod_init

Annotated Snippet

module_init(via_rng_mod_init);

static void __exit via_rng_mod_exit(void)
{
	hwrng_unregister(&via_rng);
}
module_exit(via_rng_mod_exit);

static struct x86_cpu_id __maybe_unused via_rng_cpu_id[] = {
	X86_MATCH_FEATURE(X86_FEATURE_XSTORE, NULL),
	{}
};
MODULE_DEVICE_TABLE(x86cpu, via_rng_cpu_id);

MODULE_DESCRIPTION("H/W RNG driver for VIA CPU with PadLock");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `crypto/padlock.h`, `linux/module.h`, `linux/kernel.h`, `linux/hw_random.h`, `linux/delay.h`, `asm/cpu_device_id.h`, `asm/io.h`, `asm/msr.h`.
• Detected declarations: `function xstore`, `function via_rng_data_present`, `function via_rng_data_read`, `function via_rng_init`, `function via_rng_mod_init`, `function via_rng_mod_exit`, `module init via_rng_mod_init`.
• Atlas domain: Driver Families / drivers/char.
• Implementation status: integration implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.